|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
09-19-2016, 12:33 PM | #41 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,515
|
Re: Need help from the flathead gurus...? Valve clearance issue
The Tobin ARP or Sunnen TR-6700 tappet refacing machines do use a relatively straight face grinding wheel but it only contacts between the center and the outside edge of the follower since the follower is set on a slight angle to the wheel and basically centered between the center point and outside diameter. The cam follower or tappet is spun in this position and the feed pushes the tappet into the grinder wheel along with a coolant flow. A quick skim pass off the surface will sometimes show up the wear areas on the face until it is completely refinished. I think there is a U-tube video of a machinist operating one of these bad boys.
|
09-19-2016, 12:39 PM | #42 | |
Senior Member
Join Date: Jul 2011
Location: Cotati, Calif.
Posts: 110
|
Re: Need help from the flathead gurus...? Valve clearance issue
Quote:
Your post from the other site (it's a GOOD ONE): http://www.jalopyjournal.com/forum/t...inions.420484/ I think THAT's my answer, with the turned down Comp Retainers and a new set of oem non-adjustable lifters to bring my clearances back in spec. Either that, or the Comp adjustable tappets, as they seem to be short enough to use Chevy valves without removing a TON of material. I just have no clue as to their quality, and whether or not they're heavy enough to warrant more valvespring. Where's the best place to buy a set of Zephyr springs? Red's!? |
|
Sponsored Links (Register now to hide all advertisements) |
|
09-19-2016, 12:47 PM | #43 |
Senior Member
Join Date: Apr 2015
Location: Sweden
Posts: 3,045
|
Re: Need help from the flathead gurus...? Valve clearance issue
Start by asking yourself how much springpressure do you really need...are you going to rev it hard...is it a really that wild cam with fast lift...no more then you absolutely need is best.
With a harder/longer spring you might end up with just enough pressure on the seat as is...think it over and measure some before you go shopping for more parts. |
09-19-2016, 12:53 PM | #44 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: Need help from the flathead gurus...? Valve clearance issue
Is there a problem with your current springs? The lifter you use is not a big factor in the spring selection. It will be a little bit difficult to use adjustable lifters with your reground cam without some block modifications. It can be done, but a little hard to adjust. I think your NOS lifters is the best selection.
Spring pressure is established at a spring height and thus the shims. With Chevy valves the keeper grooves are futher from the head and require a lot more shiming. Last edited by JSeery; 09-19-2016 at 01:01 PM. |
09-19-2016, 01:16 PM | #45 | |
Senior Member
Join Date: Jul 2011
Location: Cotati, Calif.
Posts: 110
|
Re: Need help from the flathead gurus...? Valve clearance issue
Quote:
Isky didn't give me a spring spec, they just tried to sell me a spring. I emailed Ron to see if he can give me some better information, but haven't heard back. My stock springs are meant to be installed at a 2.130" seat height. I should actually be really close to this with the Chevy valve, but I haven't measured yet, and that's only going to give me between 40-45 lbs on the seat...not likely enough for the Isky 88 cam and ANY kind of rpm. Anybody care to weigh in on my thought process here!? |
|
09-19-2016, 01:22 PM | #46 | |
Senior Member
Join Date: May 2010
Location: Long Island, NY
Posts: 1,052
|
Re: Need help from the flathead gurus...? Valve clearance issue
Sponsored Links (Register now to hide all advertisements)
Quote:
We are a Comp dealer but we buy the Flathead lifters direct from Topline, Comp Cams also buys theirs (811-FH's) from them so I know you'd be getting the correct parts for sure! (Add) Have never needed a "Zephyr" spring in my life, and back in the mid '80's were doing 15 Flatheads per year. We were involved heavily with a build for a Flathead powered stock-car from upstate N.Y. Owner is very good friend to this day, sold the ride a while back. Saw 5000 RPM+ every weekend going in circles?? Thanks, Gary in N.Y. P.S. It's really a headache when things don't go as planned, hang in there! Don't be "afraid" to come up here and ask questions still, like I said earlier, it'll all come around eventually.
__________________
http://www.stromberg-bulletin.com/me...berg-equipped/ |
|
09-19-2016, 01:28 PM | #47 | |
Senior Member
Join Date: Jul 2011
Location: Cotati, Calif.
Posts: 110
|
Re: Need help from the flathead gurus...? Valve clearance issue
Quote:
I really appreciate all the info. Hey, so is that a stock spring!? And do you install it at the recommended 2.130" height, resulting in...40-ish lbs on the seat? I'm going to take my springs in and have them bench tested, and then take some measurements with a test spring in my block. |
|
09-19-2016, 01:36 PM | #48 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: Need help from the flathead gurus...? Valve clearance issue
Think around 55 lbs seat pressure is a common recommendation.
Corrected psi LOL Last edited by JSeery; 09-19-2016 at 01:43 PM. |
09-19-2016, 01:42 PM | #49 |
Senior Member
Join Date: May 2010
Location: Star, MS
Posts: 4,030
|
Re: Need help from the flathead gurus...? Valve clearance issue
I used chevy valves and adjustable lifters on a reground camshaft. I also used Zephyr springs. I don't remember what my final installed height was, but I was able to get 48-55 lbs using one .060 shim on all of them and a .010 on a few. The ones that have .010 shims are on the retainer end because of no more register on the guide. I know that ideally one shouldn't install the shims on the moving end, but the .010 shim is really light. Certainly no more that a lash cap is how I justified it to myself.
Jim at Red's Headers told me the Zephyr spring would produce about 80# on a stock ford valve. I didn't want that much, hence the longer valve and use of shims. |
09-19-2016, 01:52 PM | #50 | |
Senior Member
Join Date: Jul 2011
Location: Cotati, Calif.
Posts: 110
|
Re: Need help from the flathead gurus...? Valve clearance issue
Quote:
|
|
09-19-2016, 01:53 PM | #51 |
Senior Member
Join Date: Jul 2011
Location: Cotati, Calif.
Posts: 110
|
Re: Need help from the flathead gurus...? Valve clearance issue
So, rather than install the stock spring at the suggested 2.130" seat, I would run it on a Spring tester, see where in it's travel it made 55psi, and then install the springs AT that height!?
|
09-19-2016, 02:05 PM | #52 | |
Senior Member
Join Date: May 2010
Location: Star, MS
Posts: 4,030
|
Re: Need help from the flathead gurus...? Valve clearance issue
Quote:
Correct. I think you would want to test each spring and label it with the correct height. Mine varied a bit. Installed height varied a bit, so with matching springs with installed height, shim them to your final pressure. |
|
09-19-2016, 03:07 PM | #53 | |
Senior Member
Join Date: Jul 2011
Location: Cotati, Calif.
Posts: 110
|
Re: Need help from the flathead gurus...? Valve clearance issue
Quote:
|
|
09-19-2016, 03:22 PM | #54 |
Senior Member
Join Date: May 2010
Location: Star, MS
Posts: 4,030
|
Re: Need help from the flathead gurus...? Valve clearance issue
Yes, tappets from Red's. I didn't have to take any off the valve stems. My cam is a 3/4 grind on an original ford cam, so the lifters were lower in the bores than if I was using a stock cam. If your cam used a new blank your mileage may vary.
|
09-19-2016, 03:28 PM | #55 |
Senior Member
Join Date: Apr 2015
Location: Sweden
Posts: 3,045
|
Re: Need help from the flathead gurus...? Valve clearance issue
Ok a bit of metalurgy stainless steel doesn´t harden like carbonsteel, so there´s not hardened stems,tips or such if the valve is stainless.
Heat treatening stainless gives you different grainstructures but not hardening. What you do to add wear strenght to a stainless valve stem is coating it with something. Hard tips are welded or sprayed on. |
09-19-2016, 03:36 PM | #56 | |
Senior Member
Join Date: Jul 2011
Location: Cotati, Calif.
Posts: 110
|
Re: Need help from the flathead gurus...? Valve clearance issue
Quote:
|
|
09-19-2016, 03:42 PM | #57 |
Senior Member
Join Date: Apr 2015
Location: Sweden
Posts: 3,045
|
Re: Need help from the flathead gurus...? Valve clearance issue
Magnet is the way to go.
Valves are not always 1 piece either. Can be 3 pieces welded togetter. |
09-19-2016, 03:58 PM | #58 |
Senior Member
Join Date: Jul 2011
Location: Cotati, Calif.
Posts: 110
|
Re: Need help from the flathead gurus...? Valve clearance issue
I'm pretty sure they're just a basic, cheap, cast valve because they're dull grey in color everywhere they're not machined. I'll magnet test them tonight, though I'm failing to understand why it matters.
|
09-19-2016, 04:05 PM | #59 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: Need help from the flathead gurus...? Valve clearance issue
It doesn't, think these are responses to your question about loosing the hardness in the valve tip. In an OHV engine the rocker slides back and forth on the valve tip and even with a roller rocker there is some movement. A flathead has the valve directly above the lifter and a hardened surface is not as big a concern as an OHV engine.
|
09-19-2016, 04:24 PM | #60 | |
Senior Member
Join Date: Jul 2011
Location: Cotati, Calif.
Posts: 110
|
Re: Need help from the flathead gurus...? Valve clearance issue
Quote:
Can you tell me, conveniently, what the overall height on those TopLine adjustable lifters is, at both ends of the adjustment? Curious how close they'll be with my Chevy valves and reduced base circle cam. Thanks again for all your help! Casey |
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|